> I don't really trust Walmart for their quality but I do trust that their stuff is genuine from the supplier/manufacturer.
I don't; Walmart courts brands, tempting them with access to thousands and thousands of stores. As soon as an irreplaceable proportion of the brand's revenue comes from Walmart, they start turning the screws, lowering the price they sell the product at, forcing the supplier to reduce costs. This often ends up with the brand producing a different product, with the same name, to sell at Walmart.
I can't find fault in any party's decisions in these scenarios; consolidation is the inevitable result of capitalism.
https://www.fastcompany.com/54763/man-who-said-no-wal-mart is one example of a company that saw what was coming and refused to go along with it.